forked from opnsense/src
-
Notifications
You must be signed in to change notification settings - Fork 0
/
if_arp.h
135 lines (124 loc) · 5.41 KB
/
if_arp.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1986, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)if_arp.h 8.1 (Berkeley) 6/10/93
* $FreeBSD$
*/
#ifndef _NET_IF_ARP_H_
#define _NET_IF_ARP_H_
/*
* Address Resolution Protocol.
*
* See RFC 826 for protocol description. ARP packets are variable
* in size; the arphdr structure defines the fixed-length portion.
* Protocol type values are the same as those for 10 Mb/s Ethernet.
* It is followed by the variable-sized fields ar_sha, arp_spa,
* arp_tha and arp_tpa in that order, according to the lengths
* specified. Field names used correspond to RFC 826.
*/
struct arphdr {
u_short ar_hrd; /* format of hardware address */
#define ARPHRD_ETHER 1 /* ethernet hardware format */
#define ARPHRD_IEEE802 6 /* token-ring hardware format */
#define ARPHRD_ARCNET 7 /* arcnet hardware format */
#define ARPHRD_FRELAY 15 /* frame relay hardware format */
#define ARPHRD_IEEE1394 24 /* firewire hardware format */
#define ARPHRD_INFINIBAND 32 /* infiniband hardware format */
u_short ar_pro; /* format of protocol address */
u_char ar_hln; /* length of hardware address */
u_char ar_pln; /* length of protocol address */
u_short ar_op; /* one of: */
#define ARPOP_REQUEST 1 /* request to resolve address */
#define ARPOP_REPLY 2 /* response to previous request */
#define ARPOP_REVREQUEST 3 /* request protocol address given hardware */
#define ARPOP_REVREPLY 4 /* response giving protocol address */
#define ARPOP_INVREQUEST 8 /* request to identify peer */
#define ARPOP_INVREPLY 9 /* response identifying peer */
/*
* The remaining fields are variable in size,
* according to the sizes above.
*/
#ifdef COMMENT_ONLY
u_char ar_sha[]; /* sender hardware address */
u_char ar_spa[]; /* sender protocol address */
u_char ar_tha[]; /* target hardware address */
u_char ar_tpa[]; /* target protocol address */
#endif
};
#define ar_sha(ap) (((caddr_t)((ap)+1)) + 0)
#define ar_spa(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln)
#define ar_tha(ap) (((caddr_t)((ap)+1)) + (ap)->ar_hln + (ap)->ar_pln)
#define ar_tpa(ap) (((caddr_t)((ap)+1)) + 2*(ap)->ar_hln + (ap)->ar_pln)
#define arphdr_len2(ar_hln, ar_pln) \
(sizeof(struct arphdr) + 2*(ar_hln) + 2*(ar_pln))
#define arphdr_len(ap) (arphdr_len2((ap)->ar_hln, (ap)->ar_pln))
/*
* ARP ioctl request
*/
struct arpreq {
struct sockaddr arp_pa; /* protocol address */
struct sockaddr arp_ha; /* hardware address */
int arp_flags; /* flags */
};
/* arp_flags and at_flags field values */
#define ATF_INUSE 0x01 /* entry in use */
#define ATF_COM 0x02 /* completed entry (enaddr valid) */
#define ATF_PERM 0x04 /* permanent entry */
#define ATF_PUBL 0x08 /* publish entry (respond for other host) */
#define ATF_USETRAILERS 0x10 /* has requested trailers */
struct arpstat {
/* Normal things that happen: */
uint64_t txrequests; /* # of ARP requests sent by this host. */
uint64_t txreplies; /* # of ARP replies sent by this host. */
uint64_t rxrequests; /* # of ARP requests received by this host. */
uint64_t rxreplies; /* # of ARP replies received by this host. */
uint64_t received; /* # of ARP packets received by this host. */
uint64_t arp_spares[4]; /* For either the upper or lower half. */
/* Abnormal event and error counting: */
uint64_t dropped; /* # of packets dropped waiting for a reply. */
uint64_t timeouts; /* # of times with entries removed */
/* due to timeout. */
uint64_t dupips; /* # of duplicate IPs detected. */
};
#ifdef _KERNEL
#include <sys/counter.h>
#include <net/vnet.h>
VNET_PCPUSTAT_DECLARE(struct arpstat, arpstat);
/*
* In-kernel consumers can use these accessor macros directly to update
* stats.
*/
#define ARPSTAT_ADD(name, val) \
VNET_PCPUSTAT_ADD(struct arpstat, arpstat, name, (val))
#define ARPSTAT_SUB(name, val) ARPSTAT_ADD(name, -(val))
#define ARPSTAT_INC(name) ARPSTAT_ADD(name, 1)
#define ARPSTAT_DEC(name) ARPSTAT_SUB(name, 1)
#endif /* _KERNEL */
#endif /* !_NET_IF_ARP_H_ */